Furnace.



PATENTED JULY 18, 1905.

W. H. CHAPPELL.

I FURNACE.

APPLIOATION FILED MAY 2, 1904.

P 2 SHEETS-SHEET 1.

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PATENTBD JULY 18, 1905.

W. H. CHAPPELL.

PURNACB.

APPLIouxoN rmzn un 2. 1904.

2 SHEETS-SHEET 2.

UNTTED STATES Patenten July 1s, 1905.

PATENT FURNACE.

SPECIFICATION forming part of Letters Patent No. 795,194, dated July 18,1905.

Application filed May 2, 1904. Serial No. 206,063-

Beit known that l, IVILLIAM HENRY CHAP- PELL, a citizen of the UnitedStates, residing at Morenci, in the county of Lenawee and State of'Michigan, have invented certain new and useful Improvements inFurnaces; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements-in hot-air furnaces.

The object of the invention is to provide means whereby the radiation ofthe heat generated in the furnace may be greatly increased.

Another object is to provide means whereby the furnace may be utilizedfor burning' -both hard and soft coal.

A further object is to provide a furnace of this character which will besimple in construction, durable, and eflicient, provision being madewhereby the same may be readily cleaned out.

lVith these and other objects in view the invention consists of certainnovel features of construction, combination, and arrangement of parts,as will be more fully described, and particularly pointed out in theappended claim.

In the accompanying drawings, Figure 1 is a side elevation of a furnaceconstructed in accordance with the invention. Fig. 2 is a top plan view.Fig. 3 is a vertical longitudinal sectional view through the center ofthe furnace. Fig. LLis ahorizontal sectional view through the upperhorizontal radiator-pipes. Fig. 5 is a similar view taken just above thelire-box and through the attachment for burning soft coal. Fig. 6 is avertical cross-sectional view on the line 6 6 of Fig. l.

heferring more particularly to the drawings, 1 denotes the body of thefurnace, in the lower portion of which is arranged a lire pot or box 2,which may be of the usual or any suitable construction. any suitableshape; but it is here shown as having its walls inclined slightly inwardabove and below a cent-ral line between the top and bottom of the same,said walls being preferably corrugated, as shown.

The body 1 may be of Below the body l and sujporting the same is a base3, which forms an ash-pit, the front end of which is openandcommunicates with a doorway Ar, formed in a front plate 5. Saiddoorway is provided with a door 6.` In the front wall of the body l isalso formed a feed- Opening which communicates with a doorway 7, alsoformed in said front plate and closed by a door 8.

On the rear of the base 3 is arranged an eX- tension which forms asmoke-box 9, and in the dividing-wall between said smoke-box and theash-pit in said base is formed an opening 10, which is normally keptclosed by a door 12. The opening 10 is for the purpose of cleaning outthe smoke-box.

In the top wall of the body 1 is formed a flue-opening 13, which is incommunication with a horizontally-disposed drum or pipe 14, closed atits rear end and opening at its forward end into the forward cross-pipel5 of a horizontally disposed rectangular] y shaped radiator 16. Theouter ends of the pipe l5 are in communication with therearwardlyextending side pipes 17 of the radiator.

The rear ends of the pipes 17 are connected by and communicate with therear cross-pipe 19 of said radiator. On the rear side of the pipe 19,midway between the ends ofthe same, is arranged a rearwardly-projectingsection of pipe 20, which is adapted to communicate with the smoke-pipeor chimney-flue. (Not shown.) In the pipe 2O at its junction with thepipe 19 is arranged a damper 2l, the stem of which projects upwardlythrough the pipe 20 and has formed thereon a crank 22, with which isconnected the inner end of a forwardly-projecting operating-rod 23, theouter end of which passes through the front plate 5 and has formedthereon a handle 24, by which said damper 21 may be opened and closed.

In'the lower side of the rear cross-'pipe 19 are formed two openings24', with which are connected the upper ends of two verticallydisposedparallel radiator-pipes 25, the lower ends of which communicate with thesmokebox 9 through openings 26 in the top wall of the same.

In the lower side of the section of pipe 2() is formed an opening 27,with which is con- IOO end of a vertically-disposed pipe 28, forming anindirect flue, the lower end of which is in communication with anopening .29 in the top wall of the smoke-box 9.

vWhen starting a fire in this furnace, the damper 21 is opened and thesmoke and products of combustion pass upwardly through the flue-opening13, thence forwardly through the pipe la and into the Vforwardcross-pipe 15 of the radiator. From this pipe the smoke and gases passrearwardly through the side pipes 17 to the rear cross-pipe i9 and fromthence directly out through the pipe 2O to the chimney. After the fireis burning the damper 21 is closed, which will cause the smoke andproducts of combustion to pass downwardly through the two radiator-rapesQ5 and into the smoke-box and from thence upwardly through the indirectflue 28 into the pipe 2() and to the chimney. By this indirect coursethe heat from said products of combustion is radiated by the pipes ofthe horizontal radiator 16 and by the vertical radiator-pipes 25 and 28.The arrangement of the door 1Q in the dividing-all between the smoke-boxand ash-pit permits said box to be quickly and easily cleaned out fromthe front of the stove.

In order that the furnace may be utilized forthe burning of soft coal, ahot-air-draft device or attachment is provided, which consist-s of anopen frame the sides of which are formed of hollow sections 30, whichmay be of any suitable shape in cross-section and which are here shownas flat rectangular pipes. The Aframe may be of any suitable shape tolit within the furnace to which it is to be applied, said frame beinghere shown as being' substantially square, front, rear, and sidesections or pieces being joined at their ends by suitable dovetailconnections 31,30 that when said sections or pieces are joined togethera continuous passage will be Yformed through the same. ln the innersides of these sections are 'formed discharge-opcnings 32, through whichair is discharged. W'hen it is desired to use the furnace for theburning of soft coal, the sections of the frame 30 are-inserted throughthe feededoor of the furnace and are connected together after being'inserted. When assembled in the furnace, the frame is adapted to rest onthe upper edge of the fire pot or box on the level of the lower portionof the feeddoor. The front section of the frame is exnected the uppertended forwardly and is formed with an opening 33, which 1s arrangedadjacent to and is opened and closed by a slide-damper 34 in thefeed-door of the furnace.

When the damper 3e is opened, air will be drawn in through the openingin the front section of the frame and through the passage formed by theother sections, where itis heated, and from which it is dischargedthrough the openings 32 into the smoke ant gas arising from the softcoal in the lirepot, causing said smoke and gas to burn, therebyincreasing the heat generated by the same and enabling the furnace toproduce as much heat as when burning hard coal.

By forming the airsuppl ying attachn'ient in sections, hereinlxiforedescribed, the same may be readily inserted or removed tln'ough thefeeddoor to change the furnace from a hard to a soft coal luirner, orvice versa.

From the foregoing description, taken in connection with theaccompanying drawii'igs, the constructioii and operation of theinvention will be readily understood without requiring a more extendedexplanation.

Various changes in the form, proportion, and the minor details ofconstruction may be resorted to without departing from the prin ciple orsacrificing any of the advantages of this invention.

Having thus described my invention, what l claim as new, and desire tosecure by Letters Patent, is-W In a furnace of the character described,comprising a rectangular casing, a tapering lire-pot, and anoppositely-tapered body portion` the herein-described detachable hot-airdevice consisting of straight sections having dovetail joints at theends of the sections, said sections being' rectangular in ciosssection,provided with air-openings in their inner walls, the outer wall of theVfront section eX- tending out to conform to the front of the furnace,said sections forming a rectangular i frame to lit the lire-pot andprovided with a sliding' front door or damper in the extended portion,and said sections being removable from and replaceable within thefire-pot, for the purpose described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

Writnesses:

M. V. PALMER, J. N. CuArruLL.

lOO

